class_docstr: Base class for detectors.
code: def simple_test(self, img, img_metas, **kwargs):
      pass
  
imports: from abc import ABCMeta, abstractmethod
  from collections import OrderedDict
  import mmcv
  import numpy
  import torch
  import torch.distributed
  import torch.nn
  from mmcv.runner import auto_fp16
  from mmcv.utils import print_log
  from mmdet.utils import get_root_logger
label_desc: Use image node_id 9 for calling the BaseDetector obj's underlying member method code with example usage: obj.simple_test(img, img_metas) without return types